Firmware Update; Preparing The Usb Flash-Drive; Updating The Unit's Firmware - CH A1.5 User Manual

Two-channel power amplifier

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Firmware update

The firmware of all the CH Precision units can be updated using the USB port located at the back of the unit. Before starting the

firmware update, it is necessary to load a USB flash-drive (provided in the accessory box) with files containing the new firmware.

We recommend to use the CH USB key. If however you have to use another one, please use a FAT32-formatted USB 2.0 flash-drive

provided with your A1.5. The following procedure describes how to load the USB flash-drive with the correct files:

1. Download the latest A1.5 firmware file from

2. Decompress the

so, your USB flash-drive should contain the following files:



A1_xxx.5d1



A1_xxx.5m1



A1_xxx.5o1

where '

' indicates the firmware revision.

xxx

Make sure all these files are present at the root of your USB flash-drive, and that only one revision of these files is present. Any

missing file will make the firmware update procedure fail, while multiple versions of the same unit's firmware can lead to unstable

A1.5 behavior after update.

1. Perform the operations described in section 5.1

2. Insert the USB flash-drive into the USB port located at the back of your A1.5 unit

3. Navigate to the FACTORY SETTINGS menu (see section 4) and select the UPDATE FIRMWARE item

4. Start the Firmware Update process by pushing the OK button. Please note that the unit will perform a Reset (the display

briefly turns off and on) during the procedure

5. Once the firmware update is complete, the unit automatically goes into Standby mode. Remove the USB flash-drive and

turn the unit on. The new firmware is now active. To verify that the firmware update was effective, navigate to the

FACTORY SETTINGS menu and select the FIRMWARE VERSION item. The displayed firmware revision should match the

firmware revision on the files copied to the USB flash-drive.

Note: The firmware update process lasts 5-10 minutes, do NOT interrupt it!

Rev 1.0

file and copy the decompressed files to the root of your USB flash-drive. After doing

A15_xxx.zip

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A1.5 User Manual

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